Manufactured with a 15% larger motor that spins a bit slower than your typical bullet motor, but it also swings a MUCH larger counter-weight, which provides an EXTREMELY powerful sensation. Synergy Erotic Perfect Touch Excite-Her Bullet is waterproof with adjustable speeds. Uses 3 AA (not included.)
Everyone knows you need at least one bullet in the drawer, and this is the one I would pick! It has a great price and it's surprisingly quiet.
The cord is pretty long, useful for when your partner would like to sit back and watch you writhe or to be out of the way during a couple's romp.
As for solo play, it has different speeds that will match the mood you're in.